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Descripción: The pit has a platform or disk (10) whose surface is divided into three concentric areas or zones (3, 6). A hole (1) is formed in center of the disk or platform. A bulge (5) projects from a disk plane, so that the bulge extends completely around outer perimeter of the platform. The disk incorporates a slightly raised support  Gráficos: Inventor: José Antonio del Hoyo  


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